im trying to do my valve ajustment, the bike has 5,200 miles. but i have no clearance. i took the opener shims off and it turns out i need to thin my shims... alot. my openers need to be around 3.5mm but the lip on a shim is like 2mm. so my question is can i replace a different part then the shim, like mabey the valve seat, to gain clearance? and do ducatis need to gain clearance on there first valve ajustment usualy????